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UPLOCK
ACTUATOR
ASSEMBLY
EMERGENCY GEAR
EXTENSION HANDLE
NOSEGEAR
ACTUATOR
EMERGENCY
BLOWDOWN
BOTTLE
UPLOCK
ACTUATOR
ASSEMBLY
REGENERATIVE
SHUTTLE
VALVE
MAIN LANDING
GEAR
ACTUATOR
SHUTTLE
VALVE
TO BRAKE
METERING
VALVE
EXTEND
LINE
RETRACT
LINE
GEAR CONTROL
SOLENOID VALVE
PNEUMATIC
DUMP VALVE
UPLOCK
HOOK
ACTUATOR
NOSE DOWNLOCK
RELEASE ACTUATOR
ACCUMULATOR
BLEED
VALVE
CABIN AIR
FROM BRAKES
ACCUMULATOR
GEAR RETRACT PRESSURE SWITCH
LOW-PRESSURE SWITCH
NORMAL-PRESSURE SWITCH
TO BRAKES
HYDRAULIC
RESERVOIR
Figure 14-5. Landing Gear Emergency Extension
14-6 510OM-00
CITATION MUSTANG OPERATING MANUAL
Main Gear Downlock Mechanism
Each main gear has a mechanical downlock
mechanism (integral to the gear actuator),
which locks the main landing gear in the down
position.
Applying hydraulic pressure is the only way
to release the downlocks; therefore, no blocks
or external downlock pins are required.
Main Gear Retraction System
Figure 14-6 shows landing gear actuation during
retraction. The main gear retracts when hydraulic
pressure is applied to the retract side
of the actuators. This first releases the downlocks,
then forces the actuators to retract,
pulling the gear into the wheel wells. Before
the wheels enter the wheel wells, an automatic
braking feature (spindown) stops the
wheels from spinning to prevent loose wheel
tread or debris from striking the interior of the
wheel well. When the gear is fully retracted
into the uplocks, a switch in each uplock detects
that the main gear is up-and-locked.
Nose Gear System
Nose Gear Extension System
Nose gear extension is similar to the main
landing gear. In the wheel well, the uplock
hook is hydraulically retracted, releasing the
uplock roller on the gear. The nosewheel rotates
down and aft from the nose wheel well.
The nose gear is mechanically locked in the
extended position by a spring-actuated downlock.
A position switch on the drag brace indicates
down-and-locked.
Whenever the nosewheel is extended, nosewheel
steering is engaged, regardless of whether
the aircraft is in flight or on the ground.
Nose Gear Retraction System
During nose gear retraction, a hydraulic actuator
releases the nose gear downlock. The nose
gear actuator extends, causing the nose gear to
retract forward into the nosewheel well.
On takeoff, with weight off wheels, the nosewheel
steering remains engaged until retraction.
During retraction, nosegear steering is
disengaged and the nose gear is mechanically
centered. In the wheel well, a springloaded
mechanical uplock hook catches the
uplock roller on the gear when it retracts. A
position-sensor switch in the uplock indicates
up-and-locked.
Nose Gear Door System
Nose gear movement actuates two doors to completely
enclose the nose gear and wheel at retraction.
The doors open during gear extension
and remain open after the gear is extended.
COMPONENTS
Main Gear
Each main gear assembly includes (see
Figure 14-1):
• Trunnion
• Trailing link
• Oleo strut
• Main gear actuators with integral
downlocks
• Uplock assembly
• Main wheel tire and brake assembly
• Squat switch
Trunnion
A trunnion is the main support (leg) for each
main gear. It connects to the wheel through the
oleo strut and the trailing link and is extended
or retracted by the main gear actuator. During
extension, the trunnion (with the main gear
components attached) rotates down-and-outboard
on pivots attached to the forward and aft
wing spars.
Trailing Link
The trailing link connects the trunnion to the
wheel through a pivot and an oleo strut. It allows
the wheel to simultaneously move up and
aft when landing or during ground operations.
510OM-00 14-7
CITATION MUSTANG OPERATING MANUAL
SYSTEM PRESSURE
LEGEND
RETURN
STATIC
NITROGEN
CABIN AIR
P
P
P
CONTROL
MANIFOLD
MAIN LANDING
GEAR
ACTUATOR
NOSE GEAR
UPLOCK
ACTUATOR
UPLOCK
ACTUATOR
ASSEMBLY
EMERGENCY GEAR
EXTENSION HANDLE
NOSEGEAR
ACTUATOR
EMERGENCY
BLOWDOWN
BOTTLE
UPLOCK
ACTUATOR
ASSEMBLY
REGENERATIVE
　
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